GCC C语言处理主要函数之c_parse_init

c_parse_init：
 


/* Initialization routine for this file.  */
void
c_parse_init (void)
{
  /* The only initialization required is of the reserved word
     identifiers.  */
  unsigned int i;
  tree id;
  int mask = 0;
  /* Make sure RID_MAX hasn't grown past the 8 bits used to hold the keyword in
     the c_token structure.  */
  gcc_assert (RID_MAX <= 255);
  mask |= D_CXXONLY;
  if (!flag_isoc99)
    mask |= D_C99;
  if (flag_no_asm)
    {
      mask |= D_ASM | D_EXT;
      if (!flag_isoc99)
 mask |= D_EXT89;
    }
  if (!c_dialect_objc ())
    mask |= D_OBJC | D_CXX_OBJC;
  ridpointers = ggc_cleared_vec_alloc<tree> ((int) RID_MAX);
  for (i = 0; i < num_c_common_reswords; i++)
    {
      /* If a keyword is disabled, do not enter it into the table
  and so create a canonical spelling that isn't a keyword.  */
      if (c_common_reswords[i].disable & mask)
 {
   if (warn_cxx_compat
       && (c_common_reswords[i].disable & D_CXXWARN))
     {
       id = get_identifier (c_common_reswords[i].word);
       C_SET_RID_CODE (id, RID_CXX_COMPAT_WARN);
       C_IS_RESERVED_WORD (id) = 1;
     }
   continue;
 }
      id = get_identifier (c_common_reswords[i].word);
      C_SET_RID_CODE (id, c_common_reswords[i].rid);
      C_IS_RESERVED_WORD (id) = 1;
      ridpointers [(int) c_common_reswords[i].rid] = id;
    }
  for (i = 0; i < NUM_INT_N_ENTS; i++)
    {
      /* We always create the symbols but they aren't always supported.  */
      char name[50];
      sprintf (name, "__int%d", int_n_data[i].bitsize);
      id = get_identifier (name);
      C_SET_RID_CODE (id, RID_FIRST_INT_N + i);
      C_IS_RESERVED_WORD (id) = 1;
    }
}